Telephone-exchange system



Sept. 21,1926, 1,600,398

W. W. CARPENTER TELEPHONE EXCHANGE SYSTEM Original Filed Jan. 19. 192 4 5 she ts-Sheet 1 -QLtU 15 EH 5 9 a Sept. 21 1926. 1,600,398

w. w. CARPENTER TELEPHONE EXCHANGE SYSTEM Opiginal Filed Jan. 19. 1924 5 Sheets-Sheet 2 fizven/vr: 7 Warren W'agaenfer by My Sept. 21 1926.

I. W. W. CARPENTER TELEPHONE EXCHANGE SYSTEM Original Filed Jan. 19. 1924 5 sh e me t 5 lm enfvrx 4 Wall? Wfa/pmfe/ Sept. 21 192s.

W. W. CARPENTER TELEPHONE EXCHANGE SYSTEM Qriginal Filed Jan. 19. 1924 5 Sheets-Sheet '4 Q lm mfar [Va/re If. fame/mar Sept. 21 1926.

1,600,398 W. W. CARPENTER I TELEPHONE EXCHANGE SYSTEM Original Filed Jan. 19. 1 924 5 Sheets-Sheet 5 Patented Sept. 21, 1926.

' UNITED STATES 1,600,398 PATENT orrlcs.

WARREN W. CARPENTER, OF QUEENS, NEW YORK, AS$IGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEN YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Application filed January 19, 1924, Serial No. 687,346. Renewed April 5, 1926.

to associate the controlling mechanism with such switch for the time being in order that the switch may be governed in its selective operation. 4

Accordingly it is an object of the present invention to selectively associate the switch controlling mechanism with'the proper one of a number of switches to establish a connectionthrough such switch.

A feature of the invention relates to means for connecting a common control mechanism to a circuit incoming to any one of a number of switches together with separate means for selectively connecting the mechanism to such switch for controlling the same.

Another feature of the invention relates to a system having anumber of groups of switches with a plurality of trunks incoming to said switches and a controlling marker common to all groups and associable with any tinnk for receiving a record together with means for then connecting the marker to the proper switch in the proper group for controlling the operation thereof.

Another object of theinvention is an improvement in registering and controlling devices of the type employed in systems of the foregoing character arranged to guard against failures and improper operations.

A further feature of the invention according to this object is to provide, in a mechanism where records are registered on one register device and then transferred to another register device comprising relays, means for determining if said registers are operating properly. Referring to the drawing, Figs. 1 and 2 taken in order with Fig. 8 below Fig. 1 and-Fig. 4 below Fig. 2 illustrate a sufiici'ent portion of a telephone system to enable an understanding of this invention.

- Fig. 1 shows dlagrammatically a line I switch of the coordinate type, one of a number of '11nksoutgoing therefrom -together with a sender selector switch, also schematicaliy illustrated.

Fig. 2 shows .a portion of a first group selector switch of the coordinate "type in which terminate the trunks outgoing from the line switches.

Fig. 3 shows in schematic formone of :1 number of common register senders together with a connecting device for associating the register senders with marker controlling mechanisms.

To the left ofthe broken linein Fig. i

there is illustrated one of the common marker controlling devices. To the right of the broken line in this figure there are shown two of the numberof frame con necr'ors, each of whichv serves to connect the marker mechanisms with a difierent group of selector switches such as shown in Fig. 3

Fig. 5 is aschematic illustration showing the arrangementof the equipment.

General description of circuits and cupparams.

A general understanding of the system and the objects accomplished therein may best be had by first considering the diagram of Fig. 5. The subscribers lines 501, 502, etc., enter .the exchange and terminate in a isuflicient number of: coordinate line switches, one of which, switch 500, is shown. The trunks outgoing from these line switches are distributed among a number of groups of first or district selector switches. In the diagram two of these groups are illustrated each comprising two switches. For instance, the first group is made up of the two district switches 50? and 508,. whereas the second group consists of the two switches 509 and 510. -Thc trunks outgoing from the line switches are distributed among the switches in these groups. The two trunks 503 and 504:, for example, outgoing from the line switch 500 enter respectively, district switches 509 and 5.10 of the second group. Similarly, the trunks 505 and 50 6 appear, respectively, in

the switches 507 and 508 of the first group.

I In asimil'ar manner other trunks outgoing from the line switch 500 and from other line switches will be distributed amoung the various selectors of the various groups.

The controlling e'quipmentfor governing the selective OPGIfilZlOIlof the district switches consists of subscribers senders and controlling markers, one sender 514 and two markers 516 and 520 being illustrated. The sender 514 is common to a plurality of calling lines and the markers 516 and 520 are common to all of the district selectors in all groups. The sender 514 may be associated with any one of the trunks outgoing from the line switches by means of a coordinate sender selector switch 513. Thereafter the sender 514 through a connecting device 515 is connected to one of the con-- trolling markers such as marker 516.

At this point it becomes necessary to connect the controlling marker 516 to a particular one of the district selector switches in order to selectively operate said switch to extend a calling line over an outgoing trunk to the switch beyond. The outgoing trunks leaving switches of the first group are represented by the group 511, whereas the group of trunks 512 are the ones outgoing fromthe switches in the second group. For the purpose of connecting the marker to the district selectors there are provided a number of frame connectors 517, 518, etc. The frame connector 517 serves to connect the markers to the switches of the group containing the selectors 507 and 508. Likewise, the frame connector 518 serves to connect the markers to the group containing the switches 509 and 510. Consequently, it is necessary to determine which one of the two frame connectors shall be employed in order that the marker may be connected to the proper group of switches. If the calling subscribefis line is extended over the trunk which appears in the switch 507 in the first group, then the frame connector,517 is selectively operated to connect the marker 516 to the switch 507. In like fashion, if the calling line is extended over the trunk 503 to the switch 509, the frame connector 518 will be selectively operated instead to connect the marker 516 to the selector 509.

Since the frame connectors 425 shown in Fig. 4 and 426 are separate devices two markers may be connected to selectors at the same time. Obviously other frame connectors may be provided for other groups of selectors.

Referring to the circuit drawings, the subscribers lines terminate in vertical rows of contacts in the line switches 100. For in-' stance, line 101 together with other lines appear in the vertical row 114, whereas still other lines appear in other vertical rows of contacts. The trunks 103, 104, etc., appear, respectively, in vertical rows of contacts 115 and 116 each trunk being accessible through all of the link circuits 102, 118, etc.

The trunk 104 leaving the line switch appears in the vertical row of contacts 201 'of the district selector switch 200, having access to all of the horizontal links 205, 206, 207 and 208. A second trunk 210, which may come from any one of the line switches, appears in the vertical row of contacts 202 of the selector 200. The switch 200 is also equipped with 'a number of groups of trunks outgoing to succeeding selector switches (not shown). The trunks occupying the vertical row of contacts 203, each having an appearance before a single one of the respective horizontal links, may represent one of these groups. Similarly, a second group of trunks may ocupy the second vertical row of contacts 204. Each of these trunks, such as the trunk is multiplied to appear in a corresponding position in other district selcctor switcher.

The trunk 104 is shown having an appearance in'the sender selector switch 110. Other runlrs will similarly appear in the sender selector switch. The selector switch has access to a plurality of subscribers senders one of which is illustrated in Fig. 3.

The register sender, among other elements, consists of a plurality of relay registers, three of which, 305, 306 and 307, are illustrated. The purpose of these registers is to take the digits transmitted by the calling subscrib r and make a record thereof.

The marker illustrated in Fig. 4 consists of a number of relay registers 400, 401, 402 corresponding with the registers of the sender together with other controlling equipment.

A connecting device 320 is provided for connecting any of the common register sendwith the markers. This device may consist of a multi-contact relay structure which serves to connect the various leads from the sender through to the corresponding leads in the marker. For an understanding of the general arrangement and operation of the subscribefis sender, the switch controlling marker and the multi-contact relay device for interconnecting the same, reference is made to the application of V. W. Carpenter, Serial No. 703.362, filed April 1, 1924.

he controlling marker is connected to a district selector frame 200 by means of frame connectors 425 and 426. Frame connector 425 comprises a number of multi-contact relays 427, 428, 429 and 430. The relay 427 is individual to the particular district selector shown in the drawing. Relay 428 and .ther relays are respectively individual to other district selectors contained in the same group. Relay 430 isindividual to the marle er mechanism shown inthe drawing. In like manner, the relay 429 serves to connect another similar marker. to any of the district selector switches of this group.

Similarly the frame connector 426 serves to connect the markers to the several'district selector switches of the second group.

selector As above mentioned, the switches 100, 200.

and 110 are of the coordinate type comprising essentially a plurality of horizontal link circuits which interconnect incoming lines or trunks and outgoing lines or trunks together with cooperating bars and magnets for effecting the connections. Referring to the district selector switch 200, the link circuits 205, 206, 207, and 208 constitutea portion of the total number of links in the switch all of which serve to connect the incoming trunks to the outgoing trunks of the different groups. The vertical bars 211, 212, 213, 214v are associated respectively with the vertical rows of contacts 201, 202, 203 and 204. These'bars are operated under the control of individual magnets 218, 219, 220 and 221. The horizontal bars 215, 216, 217, etc. are operated by therespective magnets 222, 223, 224 which cooperate with the vertical bars to establish and hold the connection through the switch. The construction and operation of-these switches. may be that each of these constitutes four separate relays. In the-sender the register 305 comprises the four relays 308, 309, 310 and 311; the register 306 comprises the relays 312, 313, 314 and 3,15 and the register 307 includes the relays 31 6, 317, 318 and 319. These relays are operated in various com binations depending upon the value of the digit which they are to record.

In the manker the register 400 compris:

ing relays 403, 404, 405 and 406 corresponds to the register 305 in the sender. The :regis- V 'ter 401 includingrelays'407, 408, 409 and .410 corresponds to the register 306 of the sender. Lastly the register 402 in the marker comprising relays 411, 412, 413 and 414 corresponds to the register 307 of the sender. After the digits have been recorded on the registers of the sender it then becomes necessary to transfer this record to the marker'by operating relays inthe registers of the-marker which correspond'to the operated relays of the registers of the sender. In this way the reeordistransferred from the sender to-the markerin order that the marker may govern the operation of the switch accordingly. Inasmuch as the circuits for operating-the marker registerrelays all lead through contacts in the connecting device 320, it may sometimes happen that due to a defective contact "the proper relaysin'the marker are not operated. The-result of this,

it i the apparatus were permitted to continue functioning, would' be to setup afalse connection. Accordingly provision is made whereby a test may'be'madeeachtime a record is transferred from --the sender to the 703,362, filed April 1', 1924i.

marker to ascertain Whether ;it has been correctly trasnferred. The manner in which this is accomplished will be described in detail hereinafter.

Detailed operation. 0/ system.

V YVhen the subscriber of the callingline 101 removes his receiver, the line switch 100 is operated automatically to extend .the

calling line to an-idle trunk 104. 'F-urthermore the senderselector switch 110 is-automatically operated to connect the selected trunk 104 through .to the idle register sender illustrated in Fig. 3. lVhile the sender sean impulse circuit from the calling -subscribers line, through to the register send er.

Relay 106 closes This circuit may be'traced from battery through the winding of the impulse relay 300,v contacts of the switch 110, conductor 120, lower contactof relay 1 06, over the ring side of the trunk 104, through the switch 100, over the subscribers loop returning through'the switch 100, tip-of the trunk104,

upper contact of relay 106, conductor 121,

contacts of the switch 110, through the coil 301 to ground. The manner in which the line switch is operated to-select an, idle trunk and in which theselector switch 1.10'is operated to associate the trunk with an "idle sender is fully described in the patent to S. B. KVilliams, No. 1,517,331, granted December 2.1924. 1 i

Theimpulse relay in operating completes an obvious circuit for the slow. relay '302.

The relay 302 is the holding relay and ap- 13118 8 ground potential to conductor 326 which leads through the sender selector to conductor 122, whereby the relay 106 is held energized.

The subscriber now manipulates his transmitter to send a series of impulses representing the number and 'des'ignation of the called line. The relay 300 responds to these impulses, and causes the setting of the registers 305, 306 and 307, etc. After the registers have beenpositioned the connecting device 320 is operated to connect the register .sender'through to the marker illustrated in Fig. 4. The manner in which the registers 305, 306 and 307 are "positioned under the control of the impulse 'relay300, and the .man-ner in which the sender is'irsinn sociated with the marker through the 'con necting device 320 may he in general the same as that described in detail inthe patent toS. B. Williams, No. 1,517,331, granted December 2, 1924, and in the-5pplication of Carp 'nter',

It-will be assumedthat the designation corresponding registers 400, 401 and 402 of through the windings of relays 321, 322,

the marker. At the time the sender is connected to the marker, a holding relay 424is operated for the purpose of applying a general holding ground potential for the various relays involved in themarker. lielay 424 completes anobvious circuit for relay 417. Relay 417 closes a circuit from ground through its contacts, contact of relay 415, contacts of the device 320, thence in parallel to battery. Relay 321 applies ground potential through its contacts to conductors 327, 328, 329 and 330. These conductors lead through the connecting device 320 to the windings of relays 403, 404, 405 and 406 of the register 400. Consequently, the relays of register 400 all operate. Relay 322 connects ground through its contacts to the conductors 331, 332, 333 and 334. These corductors lead through the connecting device 320 to the windings of the respective relays of the register 401 in "the marker. Accordingly, all of these relays are operated. Furthermore, the relay 323 applies ground potential through its contacts to its conductors 335, 336, 337 and 338, which extend through the connecting device 320, to the windings of' relays 411, 412, 413 and 414. These relays are all operated.

' lVith all of the relays of register 400, 401 and 402 energized, a series circuit is completed from ground at the right contact of relay 403, thence through the right contacts of relays 404, 405, 406, 410, 409, etc. finally through the winding of relay 416 to battery.

Relay 416 operates and locks to ground at the contact of relay 417. Relay 416 coinpletes an obvious circuit for relay 415. Relay 415 opens the circuits of relays 321,

322 and323 and these relays release.

Relays 321, 322, 323 when released remove ground potential from the Various conductors, opening the energizing circuits traced for the register relays in the market. All of these relays release, except the ones which correspond to the energized relays in the registers 305, 306 and 307 of the sender. Relay 403 which corresponds to relay 308 does not release since it is held in a circuit completed throughth e contact of relay'308. Relay 405 does not release since it is held in a circuit completed through the contact of relay 310. Similarly, relays 408,410 and 411 do not release, inasmuch as they are held energized in circuits completed respectively through the contacts of relays 313, 315 and 316.

Thus all of the relays in the marker have been energized, and immediately there after all of the relays thus energized are released, excepting the ones which correspond to the energized relays of the registors in the sender. In this way a test is made of all of the circuits for the register relays in the marker, which lead through the contact points 'of the connecting device 320. i these circuits are all'intact, as they should be, all of the relays are operated, and the series circuit is completed for operating the relay 416. If on the other hand, there is a defective contact in any one of the circuits, the corresponding register relay fails to operate, and the series circuit is not completed, whereby relays 415 and 416 cannot operate. The failure of these relays to operate may serve as an indication that the markershould not proceed with the establishment of the connection.

A description will next be given of how the marker is selectively connected through one of the frame connectors 425 and 426 to the proper district selector frame 200. Inasmuch as the trunks leading from the line switches may be distributed among the district selectors of the switch groups, it is necessary that the marker should be con nected to the particular district frame to which leads the trunk over which the calling line has been extended. In the present instance, the calling line has been extended over the trunk 104 which terminates in the district frame 200. The district selector 200 along with the others in the same group 'is served by the frame connector 425.

Therefore, it becomes necessary to give the marker some indication telling it that it should make connection through the frame connector 425 to the selector switch 200.

Inasmuch as the trunks coming from the line switch each appear in a single one of the district switches. these trunks may be taken as a means of identifying the particular switch through which the connection must be extended. Therefore, by giving all of the trunks leading to a group of district switches one kind of a characteristic identification which is different from the identification given the trunks leading to each and every other group, the necessary information may be given the marker to enable it to employ the proper one :of the frame connectors. This characteristic identification consists of circuits including resistances 112 and 113 connected to the contacts-of the relay 111, individual to each of the trunks leading to the district switches. The particular .resistances 112 and 113 shown are individual to the trunk'l04. The

resistance 112 may: be remand the resistance 113 may be high for eyeryfother trunk leading to the switch 200', and to all of the switches of the same group. A different combination of resistances will be employed for the trunks leading to nother group of siivitches. For instance, for a particular group the resistance 112 maybe high and the resistance 113-ma'y be low. For still another group the resi'stance 112 may be omitted. For still another group the resistance 113 maybe omitted, etc. I

When the sender is connected the ma ker, the indication" relating'to the district group is recorded in the marker as will now be explained. First a" circuit is cornpleted from battery, through the high resistanc'e 1'13, outerileft back contact of relay 111-, 'condu'ctor 123, contacts of switch 110, conductor'340, contact ofrelay 303, through contacts of the deyice 320, winding of the relay 423, winding of relay 120, contacts of relay 421 toground on the holding conductor 135. Since .the resistance 113 is high, only relay 420 operates. Still another is" closed from battery through the low resistance 112, inner left hand back contact of relay 111. conductor 124, contacts of switch 110, conductor 3 11, contact of relay 303, contacts of device 320, marginal relay 122, relay 419, to -the grounded conductor 135 Due to the lowresistance 11 2, the ma i ginal relay 4122- operates and relay 419 also operates; With relays 4:19 and 420- operated, an obvious circuit is closed for operating the relay 41 8. With relay 4'18 operated, a

circuit is" closed" for the relay 432=at the frame connector42-5 which is indi-vidualto the marker shown. The circuit for this" relay may be traced; front ground overconductor 4535, contact of relay 421, contact of relay 418'. front contactof relay 422,-- outer back contact'of're'lay 423, win'din'g of relay 432 to battery." Relay 132 closes a circuit for relay 131 which may be traced from battery through the lower Winding of relay 4:31, upper front contact of relay 132, back contact of relay 433- to grounded conductor 435. Relay 431 looks in a circuit. frombattery through its upper windin contact, winding of relay'l33, lower contact of relay 431, lower contact oi relay 4:32, to the grounded conductor435. I Relay 133 also operates in this circuit. Relay 4:31 at its upper back contactopens the circuit to prevent succeeding similar relays from look ing; The multi-contact relay 4:30, which is inclividualto themarker shown is now operated" in a. circuit from battery, through K v N H V I be released and freed from thetrunk circuit its winding, upper contact of relay 431, front contact of relay 133, to the grounded conductor 135.

At the time the marker as e connected to I the sendera circuiti's" extended backthrough' the connecting device 320 of conductor 3 12,

g and thence through the sender selector 110, outer back contact ofrelay 111, through the. windingof the vertical operating magnett218 which controls the vertical row of co1'1ta.cts 201, in which appears the trunk 1041. The manner in which this circuit is, established is described and illustrated in the patent-to S. B. Williams, No. 1,517 ,331, granted December 2, 1924.. The magnet2l-8 rotates the vertical bar 211 to prepal a llcsets oi co'ntacts' in the Vertical row, 2011 Furthermore, the magnet 218 completes a circuit through its contacts over conductor 226, through the winding ofthe I'nulti-contact relay 127,01 the frame connecton 425. It will be noted that the Inulti-contact rel-ay427: will be operated whenever oneo'f the vertical magnets 21 8. 219, etc. in the switch 200 is operated. Thus the relay 127 identifies the particular district selector 200, and; since the niarkei" is alreacly',connect'ecl through the relay430, the relay 427 further extends connection to the operating parts of the selector switch 200. 1 a

In a manner fully described in, the patent to S. B. Wi1l-ia1ns,-No, 1,517,331,,gra 1ited Dec.'2,;192 1', the Vertical magnetlaizo relating to theproper giioiipoi outgoing trunks is operated, the horizontal link' circuits'afe. tested and the proper horizontal magatis' operated .to extend the' trunk 10.4 through a link circuit, and thence over the selected outgoing trunk 225 to the switch beyond. These operations are effected over the conductor's such} as the conductors 137 which leadfr'ointhe rnarlier' through the franie connector425 directly to: the operatingl par,t s of the frame 200. Immediately, after the connection is efi'ected,,a;holding circuit is tended the vertical Inagnets 218' and 220 are released. I The magnet 218, releases the re. 19,3 42? and the marker is disconnected from theirarne 200. i p I Had the calling line been extendecl to a district selector in som o'ther g'roup a different cornbination' of the relays'e1-9, 420, 4-22 and 7423' would have been operated, 'resultingiti the operating or a relay sucliasl relay 434 associated with the frarn'eWcon nector426l, i v

' After the connection haslbeenlest'abli'sh g1;

and the sender is'no'longer required, aima 104. Atv this tiinefthe relay, 106.. releases, and the calling line is'extended' through to the left hand windings of, the repeating coil 105. Relay 107 'oper'atesand closes" a sub-- stitute holding circuit for relay 108, which maintains ground connection conductor 125.

lVhen it is desired to release the connection the subscriber replaces his receiver on on the holding the switchhoolr and relay 107 releases. The

relay 10S 'wl "ch removes the holding ground from the conductor 125 permits the operated switches to be released.

The invention claimed is 1. The combination with a telephone line of a number of selective switches, a plurality of'trunks leading to each switch, said trunks varying in character, means for ex lending said line over any one of said trunks to said switches, a controlling marker, a switch for associating the ex tended line'with said marker, a connector for each selective switch for connecting said marker thereto, means depending upon the character of the'trunk over which said line is extended for selecting one of said connectors, means for operating the selected connector to connect said marker to the correspondingselective switch, and means governed by said marker for selectively operating the switch.

The combination with a line of a number of selective switches, a plurality of trunks leading to said switches, resistance elements for said trunks for giving each trunk a characteristic difi'ering from other trunks, means for extending said line over one of said trunks to one of said switches, a controlling marker common to said switches, means for associating said marker with the extended line, a connector for each of said switches for connecting said marker thereto, means dependent upon the resistance elements associated with the trunk over-which the line is extended for selecting one of said connectors, and means controlled by the marker 'for selectively operating the switch to which it is connected.

3. The combination with a telephone line of a number of groups of switches, a plurality of trunks leading to each switch, all trunks leading to the switches of each group having a characteristic difiering from the trunks leading to other groups, a controlling marker, means for associating the extended line with said marker, a connector for each group of switches for connecting said marker to any one of the switches thereof,

means dependent upon the characteristic ofv the trunk over which the line is extended for selecting one of said connectors for operation, and means controlled by the marker for selectively operating" the particular switch to which it is connected.

4. The combination in a telephone system of a plurality of registers for receiving a record, a second plurality of registers, means for connecting the first registers to the second registers, means for transferring the record from the first to the second registers by operating said second registers naccordancewith the operated condition of saith-- first registers, and means for determining if said second registers are operating properly.

5. The combination in a telephone system of a plurality of registers for receiving a record, a second plurality of registers, means for connecting the first registers to the second registers, means for transferring the record from the first to the second registers by operating said second registers in accordance with the operated condition o'fsaid first registers, and means controlled by the second registers for determining if they' are operating properly. i

6. The combination in a telephone system of a set of registers forreceiving the record, a second set of registers, means for connecting the first set of registers to the second set of registers, means for operating all of the registers of the second set and, releasing all of said registers, excepting the ones cor responding to the operated registers of the first set, and means rendered etfective if all of the registers of said second set operate properly.

. In combination a set of relay registers,

a second set of relay registers, means for.

operating the-relays of said first set to establish a record thereon, means for connecting the first set to the second set, means for operating all of the relays ofthe said second set initially, means for releasing all the relays of said second set, excepting those which correspond to operated relays of the first set,

and a relay controlled through contacts of.

relays of the second set when in their operated condition. 7

9. The combinationwith a telephone line of a number of selective switches, a plurality of trunks leading to each switch, a combination of high and low resistance elements associated witheach of said trunks for. givying each trunk a characteristic difiering from other trunks, means for extending said line over one of said trunksto one of said switches, a controlling marker commoh to said switches including therein a plurality of relays, means for associating the marker with the extended line, a connector for each of said switches for connecting said marker thereto, said relays being variably operable in accordance with the combination of resistance elements-associated with the trunk over which the line is extended for selecting one of said connectors, and

means controlled by the marker for selectively operating the switch to which it is connected.

In witness whereof, I hereunto subscribe my name this 18th day of January A. D.,

WARREN W. CARPENTER. 

